├── .editorconfig ├── .gitignore ├── example └── index.ts ├── package-lock.json ├── package.json ├── readme.md ├── src ├── Injector.ts ├── ServiceDecorator.ts └── Util.ts ├── test └── InjectorTest.ts └── tsconfig.json /.editorconfig: -------------------------------------------------------------------------------- 1 | # Editor configuration, see http://editorconfig.org 2 | root = true 3 | 4 | [*] 5 | charset = utf-8 6 | indent_style = space 7 | indent_size = 2 8 | insert_final_newline = true 9 | trim_trailing_whitespace = true 10 | 11 | [*.md] 12 | max_line_length = off 13 | trim_trailing_whitespace = false -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | node_modules 2 | .idea 3 | -------------------------------------------------------------------------------- /example/index.ts: -------------------------------------------------------------------------------- 1 | import {Service} from "../src/ServiceDecorator"; 2 | import {Injector} from "../src/Injector"; 3 | 4 | @Service() 5 | class Foo { 6 | doFooStuff() { 7 | console.log('foo'); 8 | } 9 | } 10 | 11 | @Service() 12 | class Bar { 13 | constructor(public foo: Foo) { 14 | } 15 | 16 | doBarStuff() { 17 | console.log('bar'); 18 | } 19 | } 20 | 21 | @Service() 22 | class Foobar { 23 | constructor(public foo: Foo, public bar: Bar) { 24 | } 25 | } 26 | 27 | const foobar = Injector.resolve(Foobar); 28 | foobar.bar.doBarStuff(); 29 | foobar.foo.doFooStuff(); 30 | foobar.bar.foo.doFooStuff(); 31 | 32 | // 33 | // A more "real world" example 34 | // 35 | 36 | @Service() 37 | class DatabaseHandler { 38 | insert(table: string, data: { [column: string]: string|number }) { 39 | console.log(`writing to ${table}:`); 40 | console.log(data) 41 | } 42 | } 43 | 44 | @Service() 45 | class Logger { 46 | constructor(protected dbHandler: DatabaseHandler) { 47 | } 48 | 49 | info(message: string) { 50 | this.dbHandler.insert('log', { 51 | level: 200, 52 | message: message 53 | }); 54 | } 55 | } 56 | 57 | // Classes without decorators do NOT emit metadata, hence we need to decorate the controller class. 58 | const Controller = () : ClassDecorator => { 59 | return target => { 60 | // maybe do something with controller here 61 | }; 62 | }; 63 | 64 | @Controller() 65 | class UserController { 66 | constructor(protected logger: Logger) { 67 | } 68 | 69 | editUser(userId: number) { 70 | // edit user ... 71 | this.logger.info(`User ${userId} has been edited`); 72 | } 73 | } 74 | 75 | const userControllerInstance = Injector.resolve(UserController); 76 | userControllerInstance.editUser(3); 77 | -------------------------------------------------------------------------------- /package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "di-ts", 3 | "requires": true, 4 | "lockfileVersion": 1, 5 | "dependencies": { 6 | "@types/chai": { 7 | 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-------------------------------------------------------------------------------- 1 | { 2 | "name": "di-ts", 3 | "description": "Basic DI implementation in TS, see https://nehalist.io/dependency-injection-in-typescript/", 4 | "private": true, 5 | "author": { 6 | "name": "Kevin Hirczy", 7 | "email": "kevin@nehalist.io", 8 | "url": "https://nehalist.io" 9 | }, 10 | "main": "index.js", 11 | "license": "MIT", 12 | "scripts": { 13 | "example": "ts-node ./example/index.ts", 14 | "test": "mocha -r ts-node/register test/*Test.ts" 15 | }, 16 | "devDependencies": { 17 | "@types/chai": "^4.0.4", 18 | "@types/mocha": "^2.2.43", 19 | "@types/node": "^8.0.14", 20 | "chai": "^4.1.2", 21 | "mocha": "^3.5.0" 22 | }, 23 | "dependencies": { 24 | "reflect-metadata": "^0.1.10", 25 | "ts-node": "^3.2.1", 26 | "typescript": "^2.4.2" 27 | } 28 | } 29 | -------------------------------------------------------------------------------- /readme.md: -------------------------------------------------------------------------------- 1 | # Dependency Injection in TypeScript 2 | 3 | Basic DI implementation in TS, see [nehalist.io/dependency-injection-in-typescript/](https://nehalist.io/dependency-injection-in-typescript/). 4 | -------------------------------------------------------------------------------- /src/Injector.ts: -------------------------------------------------------------------------------- 1 | import 'reflect-metadata'; 2 | import {Type} from "./Util"; 3 | 4 | /** 5 | * The Injector stores services and resolves requested instances. 6 | */ 7 | export const Injector = new class { 8 | /** 9 | * Resolves instances by injecting required services 10 | * @param {Type} target 11 | * @returns {T} 12 | */ 13 | resolve(target: Type): T { 14 | // tokens are required dependencies, while injections are resolved tokens from the Injector 15 | let tokens = Reflect.getMetadata('design:paramtypes', target) || [], 16 | injections = tokens.map(token => Injector.resolve(token)); 17 | 18 | return new target(...injections); 19 | } 20 | }; 21 | -------------------------------------------------------------------------------- /src/ServiceDecorator.ts: -------------------------------------------------------------------------------- 1 | import {GenericClassDecorator, Type} from "./Util"; 2 | 3 | /** 4 | * @returns {GenericClassDecorator>} 5 | * @constructor 6 | */ 7 | export const Service = () : GenericClassDecorator> => { 8 | return (target: Type) => { 9 | // do something with `target`, e.g. some kind of validation or passing it to the Injector and store them 10 | }; 11 | }; 12 | -------------------------------------------------------------------------------- /src/Util.ts: -------------------------------------------------------------------------------- 1 | /** 2 | * Type for what object is instances of 3 | */ 4 | export interface Type { 5 | new(...args: any[]): T; 6 | } 7 | 8 | /** 9 | * Generic `ClassDecorator` type 10 | */ 11 | export type GenericClassDecorator = (target: T) => void; 12 | -------------------------------------------------------------------------------- /test/InjectorTest.ts: -------------------------------------------------------------------------------- 1 | import { expect } from 'chai'; 2 | import {Injector} from "../src/Injector"; 3 | import {Service} from "../src/ServiceDecorator"; 4 | 5 | // Fixtures 6 | @Service() 7 | export class Foo { 8 | } 9 | 10 | @Service() 11 | export class Bar { 12 | } 13 | 14 | @Service() 15 | export class Foobar { 16 | constructor(public foo: Foo, public bar: Bar) { 17 | } 18 | } 19 | 20 | @Service() 21 | export class Baz { 22 | constructor(public foobar: Foobar) { 23 | } 24 | } 25 | 26 | describe('Injector', () => { 27 | it('should create simple instances', () => { 28 | let foo = Injector.resolve(Foo); 29 | expect(foo).to.be.an.instanceof(Foo); 30 | }); 31 | 32 | it('should create dependency injected instances', () => { 33 | let foobar = Injector.resolve(Foobar); 34 | expect(foobar.foo).to.be.an.instanceof(Foo); 35 | expect(foobar.bar).to.be.an.instanceof(Bar); 36 | }); 37 | 38 | it('should create deep dependency injected instances', () => { 39 | let baz = Injector.resolve(Baz); 40 | expect(baz.foobar).to.be.an.instanceof(Foobar); 41 | expect(baz.foobar.foo).to.be.an.instanceof(Foo); 42 | expect(baz.foobar.bar).to.be.an.instanceof(Bar); 43 | }); 44 | }); 45 | -------------------------------------------------------------------------------- /tsconfig.json: -------------------------------------------------------------------------------- 1 | { 2 | "compilerOptions": { 3 | "target": "ES6", 4 | "moduleResolution": "node", 5 | "experimentalDecorators": true , 6 | "emitDecoratorMetadata": true, 7 | "types": [ 8 | "node", "mocha", "chai" 9 | ] 10 | } 11 | } 12 | --------------------------------------------------------------------------------